It's a slippery slope, if you want to allow other brands to mix in the class then my understanding is that you need to allow SCT wheels for the P4de Shapeshifter. The only reason why I want to test SCT wheels on my ET410 is because I like PinPoint's... it would be even better if they made Pyramid's which I like the best for the turf in our area, but right now ProLine only offers Prisms for the rear tires in ST and that tread is better suited for carpet than turf. Perhaps if ProLine offered all the same tread patterns for ST then I could see keeping that restriction, but you need to open up the wheel restriction simply because there are more SCT tire options to choose and that's critical for any racing class to be sustainable.